3 years ago

Find the measure of arc CE.

Mathematics

2 answers:

almond37 [142]3 years ago

7 0

∠CAE is is the central angle ⇒ arc CE = ∠CAE
∠СAE = ∠СAD + ∠DAE = 40° + 25° = 65°
So arc CE = 65°

kati45 [8]3 years ago

6 0

Arc CE = 40 + 25 = 65
answer
65

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what is the probability of seeing a sample mean for 21 observations less or equal to the sample mean that we observed

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Step-by-step explanation:

The missing parameters are:

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$\mu = 20$ --- population mean

$\sigma = 16$ -- population standard deviation

Required

$P(x \le 21)$

First, calculate the sample standard deviation

$\sigma_x = \frac{\sigma}{\sqrt n}$

$\sigma_x = \frac{16}{\sqrt {64}}$

$\sigma_x = \frac{16}{8}$

$\sigma_x = 2$

Next, calculate the sample mean $\bar_x$

$\bar x = \mu$

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So, we have:

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